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/*
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* Copyright (C) 1999 Rob Crittenden (rcrit@greyoak.com)
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* Copyright (C) 1999,2000 Ross Combs (rocombs@cs.nmsu.edu)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#define BNETTIME_INTERNAL_ACCESS
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#include "common/setup_before.h"
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#include <stdio.h>
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#ifdef HAVE_STDDEF_H
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# include <stddef.h>
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#else
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# ifndef NULL
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# define NULL ((void *)0)
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# endif
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#endif
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#ifdef HAVE_STRING_H
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# include <string.h>
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#else
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# ifdef HAVE_STRINGS_H
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# include <strings.h>
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# endif
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#endif
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#ifdef HAVE_UNISTD_H
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# include <unistd.h>
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#endif
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#include <errno.h>
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#include "compat/strerror.h"
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#ifdef TIME_WITH_SYS_TIME
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# include <sys/time.h>
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# include <time.h>
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#else
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# ifdef HAVE_SYS_TIME_H
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# include <sys/time.h>
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# else
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# include <time.h>
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# endif
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#endif
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#include "compat/gettimeofday.h"
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#ifdef HAVE_SYS_TYPES_H
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# include <sys/types.h>
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#endif
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#include "common/eventlog.h"
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#include "common/bn_type.h"
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#include "common/bnettime.h"
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#include "common/setup_after.h"
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/*
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* By comparing the hex numbers from packet dumps with the times displayed
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* on the login screen, bnettime seems to be in units of 10E-7 seconds. It
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* is stored in a 64bit value, and represented as two distinct numbers when
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* it is used as a string in the protocol.
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*
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* examples (client in GMT timezone):
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* 11/04/99 05:16 0x01 "29304451 3046165090"
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* 01/03/99 11:19 0x01 "29243146 3825346784"
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* 08/02/99 21:28 0x01 "29285677 4283311890"
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* 12/12/99 01:55 0x01 "29312068 151587081"
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*
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* The top number seems to be in units of about 7 minutes because the bottom
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* number rolls over every 2^32 10E-7 seconds, which is:
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* (2^32)*.0000001
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* 429.4967296 // seconds
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* 429/60
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* 7.15827882666666666666 // minutes
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*
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* The epoch was determined using a binary search looking for Jan 1, 1970
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* (GMT) to be displayed after setting the last game time to a pair of
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* numbers. It was determined through all 64 bits by looking for the exact
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* number where adding one pushes it over to 00:01. It was determined to be:
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* "27111902 3577643008"
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*
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* It appears that this is the same format as is used in MS-DOS to store file
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* times. The format is a 64 bit number telling how many 100 nanosecond
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* intervals since Jan 1, 1601.
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*
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* If I was clever I should be able to do this without floating point math.
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* I don't feel like being clever though :) (Refer to the function
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* DOSFS_UnixTimeToFileTime() in dosfs.c in the WINE source code for an
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* example that I wish I had seen before writing this).
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*
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* Update... from looking at the WINE sources VAP has determined that these
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* are actually in MS-Windows FileTime format.
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*
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* "In the WINE listing, you can see that
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* FileTime = (UnixTime * 10 000 000) + 116 444 736 000 000 000 + remainder
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* These dates are represented from 1 Jan 1601."
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*/
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#define SEC_PER_USEC .0000001
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#define UNIX_EPOCH 11644473600. /* seconds the Unix epoch is from the bnettime epoch */
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#define SEC_PER_UPPER 429.4967296 /* (2^32)*10E-7 */
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#define SEC_PER_LOWER .0000001
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#define UPPER_PER_SEC .00232830643653869628 /* 10E7/(2^32) */
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#define LOWER_PER_SEC 10000000.
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extern t_bnettime secs_to_bnettime(double secs)
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{
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t_bnettime temp;
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temp.u = (unsigned int)(secs*UPPER_PER_SEC);
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temp.l = (unsigned int)(secs*LOWER_PER_SEC);
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return temp;
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}
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extern double bnettime_to_secs(t_bnettime bntime)
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{
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return ((double)bntime.u)*SEC_PER_UPPER+
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((double)bntime.l)*SEC_PER_LOWER;
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}
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extern t_bnettime time_to_bnettime(time_t stdtime, unsigned int usec)
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{
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return secs_to_bnettime((double)stdtime+(double)usec*SEC_PER_USEC+UNIX_EPOCH);
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}
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extern time_t bnettime_to_time(t_bnettime bntime)
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{
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return (time_t)(bnettime_to_secs(bntime)-UNIX_EPOCH);
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}
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/* return current time as bnettime */
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extern t_bnettime bnettime(void)
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{
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struct timeval tv;
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if (gettimeofday(&tv,NULL)<0)
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{
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eventlog(eventlog_level_error,__FUNCTION__,"could not get time (gettimeofday: %s)",pstrerror(errno));
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return time_to_bnettime(time(NULL),0);
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}
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return time_to_bnettime((time_t)tv.tv_sec,tv.tv_usec);
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}
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/* FIXME: the string functions here should probably go in account_wrap */
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extern char const * bnettime_get_str(t_bnettime bntime)
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{
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static char temp[1024];
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sprintf(temp,"%u %u",bntime.u,bntime.l);
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return temp;
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}
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extern int bnettime_set_str(t_bnettime * bntime, char const * timestr)
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{
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if (!bntime)
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{
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eventlog(eventlog_level_error,__FUNCTION__,"got NULL bntime");
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return -1;
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}
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if (!timestr)
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{
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eventlog(eventlog_level_error,__FUNCTION__,"got NULL timestr");
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return -1;
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}
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if (sscanf(timestr,"%u %u",&bntime->u,&bntime->l)!=2)
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return -1;
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return 0;
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}
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extern void bnettime_to_bn_long(t_bnettime in, bn_long * out)
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{
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if (!out)
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{
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eventlog(eventlog_level_error,__FUNCTION__,"got NULL out");
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return;
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}
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bn_long_set_a_b(out,in.u,in.l);
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}
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extern void bn_long_to_bnettime(bn_long in, t_bnettime * out)
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{
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if (!out)
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{
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eventlog(eventlog_level_error,__FUNCTION__,"got NULL out");
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return;
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}
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out->u = bn_long_get_a(in);
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out->l = bn_long_get_b(in);
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}
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extern int local_tzbias(void) /* in minutes */
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{
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#ifdef HAVE_MKTIME
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time_t now;
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time_t test;
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time_t testloc;
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struct tm * temp;
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now = time(NULL);
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if (!(temp = gmtime(&now)))
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return 0;
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if ((test = mktime(temp))==(time_t)(-1))
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return 0;
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if (!(temp = localtime(&now)))
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return 0;
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if ((testloc = mktime(temp))==(time_t)(-1))
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return 0;
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if (testloc>test) /* time_t is probably unsigned... */
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return -(int)(testloc-test)/60;
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return (int)(test-testloc)/60;
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#else
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return 0; /* can't determine current offset */
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#endif
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}
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extern t_bnettime bnettime_add_tzbias(t_bnettime bntime, int tzbias)
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{
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return secs_to_bnettime(bnettime_to_secs(bntime)-(double)tzbias*60.0);
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}
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